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EP-4401099-B1 - WIRELESS CHARGING COIL WINDING METHOD, ELECTRONIC DEVICE, AND COMMUNICATION SYSTEM

EP4401099B1EP 4401099 B1EP4401099 B1EP 4401099B1EP-4401099-B1

Inventors

  • HUANG, HUA
  • ZHANG, XIALING
  • SONG, Jiaxiang

Dates

Publication Date
20260506
Application Date
20230414

Claims (10)

  1. A wireless charging coil, wherein the wireless charging coil comprises K coils, an i th coil has a larger winding diameter than an (i+1) th coil, and the (i+1) th coil is located inside the i th coil, wherein 1≤i≤K-1; and each of the K coils respectively comprises N layers of wires (121, 122, 123), and a wire at a j th layer of the i th coil is on a same plane as a wire at a j th layer of the (i+1) th coil, wherein N≥j≥1, characterized in that the K coils comprise at least two coils whose N layers of wires are series-parallel-wound and that are sequentially connected from an inner loop to an outer loop or from the outer loop to the inner loop, wherein a first coil of the at least two coils whose N layers of wires are series-parallel-wound comprises a first N layers of wires and a second coil of the at least two coils whose N layers of wires are series-parallel-wound comprises a second N layers of wires, a y th layer (122) of the first N layers of wires comprises at least a first wire (1221A) and a second wire (1221B), and a y th layer (122) of the second N layers of wires comprises at least a third wire (1222A) and a fourth wire (1222B); and an outlet (1211b) of a wire (1211) at a (y-1) th layer (121) of the first N layers of wires is connected to an inlet (1212a) of a wire (1212) at a (y-1) th layer (121) of the second N layers of wires, an inlet (1211a) of the wire (1211) at the (y-1) th layer (121) of the first N layers of wires is connected to an inlet (1221Aa) of the first wire (1221A) at the y th layer (122) of the first N layers of wires, the outlet (1211b) of the wire (1211) j at the (y-1) th layer (121) of the first N layers of wires is connected to an outlet (1211Ab) of the first wire (1211A) at the y th layer (122) of the first N layers of wires, the inlet (1212a) of the wire (1212) at the (y-1) th layer (121) of the second N layers of wires is further connected to an inlet (1222Aa) of the third wire (1222A) at the y th layer (122) of the second N layers of wires, an outlet (1212b) of the wire (1212) at the (y-1) th layer (121) of the second N layers of wires is connected to an outlet (1222Ab) of the third wire (1222A) at the y th (122) of the second N layers of wires, the outlet (1212b') of the wire (1212) at the (y-1) th layer (121) of the second N layers of wires is further connected to an inlet (1222Ba') of the fourth wire (1222B) at the y th layer (122) of the second N layers of wires, an inlet (1221Ba) of the second wire (1221B) at the y th layer (122) of the first N layers of wires is connected to an inlet (1231a) of a wire (1231) at a (y+1) th layer (123) of the first N layers of wires, an outlet (1221Bb) of the second wire (1221B) at the y th layer (122) of the first N layers of wires is connected to an outlet (1231b) of the wire (1231) at the (y+1) th layer (123) of the first N layers of wires, the inlet (1222Ba) of the fourth wire (1222B) at the y th layer (122) of the second N layers of wires is connected to an inlet (1232a) of a wire (1232) at a (y+1) th layer (123) of the second N layers of wires, an outlet (1222Bb) of the fourth wire (1222B) at the y th layer (122) of the second N layers of wires is connected to an outlet (1232b) of the wire (1232) at the (y+1) th layer (123) of the second N layers of wires, the outlet (1222Bb') of the fourth wire (1222B) at the y th layer (122) of the second N layers of wires is further connected to the inlet (1231a') of the wire (1231) at the (y+1) th layer (123) of the first N layers of wires, and the outlet of the wire (1232) at the (y+1) th layer (123) of the second N layers of wires is connected to the inlet of the wire (1231) at the (y+1) th layer (123) of the first N layers of wires, wherein N>y>1.
  2. The wireless charging coil according to claim 1, wherein remaining coils of the K coils comprise any one or more of the following coils: a coil whose N layers of wires are wound in parallel, a coil whose N layers of wires are wound in series, and a coil whose N layers of wires are series-parallel-wound.
  3. The wireless charging coil according to claim 2, wherein the remaining coils comprise the coil whose N layers of wires are wound in parallel, wherein in the coil whose N layers of wires are wound in parallel, inlets of wires at all layers are connected, and outlets of wires at all layers are connected.
  4. The wireless charging coil according to claim 2 or 3, wherein the remaining coils comprise the coil whose N layers of wires are wound in series, wherein the coil whose N layers of wires are wound in series comprises: in the N layers of wires, an outlet of a wire at an x th layer is connected to an inlet of a wire at an (x+1) th layer, wherein 1≤x≤N-1.
  5. The wireless charging coil according to claim 2 or 3, wherein the remaining coils comprise at least two coils whose N layers of wires are wound in series and that are sequentially connected from an inner loop to an outer loop or from the outer loop to the inner loop, wherein a first coil of the at least two coils whose N layers of wires are wound in series comprises a first N layers of wires and a second coil of the at least two coils whose N layers of wires are wound in series comprises a second N layers of wires, an outlet of a wire at an x th layer of the first N layers of wires is connected to an inlet of a wire at an x th layer of the second N layers of wires, an outlet of the wire at the x th layer of the second N layers of wires is connected to an inlet of a wire at an (x+1) th layer of the second N layers of wires, and an outlet of the wire at the (x+1) th layer of the second N layers of wires is connected to an inlet of a wire at an (x+1) th layer of the first N layers of wires, wherein 1≤x≤N-1.
  6. The wireless charging coil according to any one of claims 1 to 5, wherein a shape of the K coils comprises: a circle, an ellipse, a racetrack, a rectangle, or a triangle.
  7. The wireless charging coil according one of claims 1 to 6, wherein each layer of the N layers of wires comprises one wire or a plurality of wires.
  8. The wireless charging coil according to any one of claims 1 to 7, wherein an insulation layer is disposed between two adjacent layers of the N layers of wires.
  9. An electronic device (100), wherein the electronic device comprises the wireless charging coil according to any one of claims 1 to 8.
  10. A communication system (10), comprising a charging device (200) and a terminal (100), wherein the charging device comprises the wireless charging coil (230) according to any one of claims 1 to 8, the terminal comprises the wireless charging coil according to any one of claims 1 to 8, and the wireless charging coil of the charging device is configured to send a signal to the wireless charging coil of the terminal.

Description

This application claims priority to Chinese Patent Application No. 202210550580.6, filed with the China National Intellectual Property Administration on May 20, 2022 and entitled "WIRELESS CHARGING COIL WINDING METHOD, ELECTRONIC DEVICE, AND COMMUNICATION SYSTEM". TECHNICAL FIELD This application relates to the field of terminals, and in particular, to a wireless charging coil winding method, an electronic device, and a communication system. BACKGROUND With the development of a wireless charging technology, more electronic devices use the wireless charging technology. During implementation of the wireless charging technology, a transmitter coil disposed in a wireless charger is conducted with an alternating current of specific frequency, to generate an alternating magnetic field. A receiver coil disposed in an electronic device generates an induced current in the alternating magnetic field, and charges the electronic device. In other words, the wireless transceiver coils implement wireless power transmission through electromagnetic coupling. However, due to limitation of a size of a receiver coil in a small-scale electronic device, there is a large difference in sizes of transceiver coils, and an electromagnetic coupling coefficient between the transceiver coils is low. This results in a small induced voltage generated in the small-scale electronic device and low charging efficiency. How to resolve the foregoing problem is currently a problem to be urgently resolved. Other previously proposed arrangements are disclosed in EP 3806117 A1, JP 2019140223 A, CN 111092495 A, CN 108922744 B and JP 2001325574 A. SUMMARY The invention relates to a wireless charging coil as defined in independent claim 1. Further embodiments of the invention are defined in the dependent claims. The application further discloses a wireless charging coil winding method, an electronic device, and a communication system. In the wireless charging coil winding method, based on specifications of a coil to be designed, a coil of any quantity of layers and any quantity of turns can be obtained by using a combination of any one or more of the following manners: an N-layer 1-turn coil whose N layers of wires are wound in parallel, an N-layer N-turn coil whose N layers of wires are wound in series, an N-layer M-turn coil (N>M) whose N layers of wires are series-parallel-wound and a part of wires are wound in series, and the like. In this way, in a case in which a size of the coil is limited, a multi-layer multi-turn wound coil is designed, to improve wireless charging efficiency. According to a first aspect, this application provides a wireless charging coil according to independent claim 1 . The inventive wireless charging coil includes K coils, wherein an ith coil has a larger winding diameter than an (i+1)th coil, and the (i+1)th coil is located inside the ith coil, where 1≤i≤K-1; and each of the K coils respectively includes N layers of wires, and a wire at a jth layer of the ith coil is on a same plane as a wire at a jth layer of the (i+1)th coil, where N≥j≥1. This wireless charging coil is characterized in that the K coils include at least two coils whose N layers of wires are series-parallel-wound and that are sequentially connected from an inner coil to an outer coil or from the outer coil to the inner coil, wherein a first coil of the at least two coils whose N layers of wires are series-parallel-wound comprises a first N layers of wires and a second coil of the at least two coils whose N layers of wires are series-parallel-wound comprises a second N layers of wires, a yth layer of the first N layers of wires includes at least a first wire and a second wire, and a yth layer of the second N layers of wires includes at least a third wire and a fourth wire. An outlet of a wire at a (y-1)th layer of the first N layers of wires is connected to an inlet of a wire at a (y-1)th layer of the second N layers of wires, an inlet of the wire at the (y-1)th layer of the first N layers of wires is connected to an inlet of the first wire at the yth layer of the first N layers of wires, the outlet of the wire at the (y-1)th layer of the first N layers of wires is connected to an outlet of the first wire at the yth layer of the first N layers of wires, the inlet of the wire at the (y-1)th layer of the second N layers of wires is further connected to an inlet of the third wire at the yth layer of the second N layers of wires, an outlet of the wire at the (y-1)th layer of the second N layers of wires is connected to an outlet of the third wire at the yth layer of the second N layers of wires, the outlet of the wire at the (y-1)th layer of the second N layers of wires is further connected to an inlet of the fourth wire at the yth layer of the second N layers of wires, an inlet of the second wire at the yth layer of the first N layers of wires is connected to an inlet of a wire at a (y+1)th layer of the first N layers of wires, an outlet of the second wire a